1997 When ex Navy Seal Patrick Mursult's family are found murdered, he is the number one suspect. But NCIS Special Agent Shannon Moss isn't convinced, particularly after Patrick apparently commits suicide. 2014 Years after the brutal killings, while working undercover, Moss stumbles across a witness from the Mursult case who unwittingly tells her far more than she had at the time. Inspired by this retrospective progress, Moss determines to travel through time to a host of potential futures to track down the killer and close this cold case once and for all.